With CheckThat you can keep a list of music, movies, TV shows and books that you still have to "check out". It searches through different databases (iTunes, Discogs etc.) to get the most results for you.
You can search for Artists, Authors, Directors, Titles, Releases and some more, so even when you're not sure what that song was called again, you still have a chance to find it!
There is also an option to directly buy an Album, Movie, TV Show or Book in the iTunes Store.
This is the first release of the app, i plan to add more features in the near future. If you have feedback / ideas please put them in the comments!